From 3fe64abcde55cf6f4ea5883106301baad219a7cc Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Wed, 12 Apr 2023 13:26:06 +0200 Subject: [PATCH] block/nfs: do not poll within a coroutine Since the former nfs_get_allocated_file_size is now a coroutine function, it must suspend rather than poll. Switch BDRV_POLL_WHILE() to a qemu_coroutine_yield() loop and schedule nfs_co_generic_bh_cb() in place of the call to bdrv_wakeup(). Fixes: 82618d7bc341 ("block: Convert bdrv_get_allocated_file_size() to co_wrapper", 2023-02-01) Signed-off-by: Paolo Bonzini Reviewed-by: Eric Blake Reviewed-by: Kevin Wolf Message-Id: <20230412112606.80983-1-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini --- block/nfs.c | 24 +++++++++++++----------- 1 file changed, 13 insertions(+), 11 deletions(-) diff --git a/block/nfs.c b/block/nfs.c index 351dc6ec8d..006045d71a 100644 --- a/block/nfs.c +++ b/block/nfs.c @@ -726,10 +726,8 @@ nfs_get_allocated_file_size_cb(int ret, struct nfs_context *nfs, void *data, if (task->ret < 0) { error_report("NFS Error: %s", nfs_get_error(nfs)); } - - /* Set task->complete before reading bs->wakeup. */ - qatomic_mb_set(&task->complete, 1); - bdrv_wakeup(task->bs); + replay_bh_schedule_oneshot_event(task->client->aio_context, + nfs_co_generic_bh_cb, task); } static int64_t coroutine_fn nfs_co_get_allocated_file_size(BlockDriverState *bs) @@ -743,15 +741,19 @@ static int64_t coroutine_fn nfs_co_get_allocated_file_size(BlockDriverState *bs) return client->st_blocks * 512; } - task.bs = bs; + nfs_co_init_task(bs, &task); task.st = &st; - if (nfs_fstat_async(client->context, client->fh, nfs_get_allocated_file_size_cb, - &task) != 0) { - return -ENOMEM; - } + WITH_QEMU_LOCK_GUARD(&client->mutex) { + if (nfs_fstat_async(client->context, client->fh, nfs_get_allocated_file_size_cb, + &task) != 0) { + return -ENOMEM; + } - nfs_set_events(client); - BDRV_POLL_WHILE(bs, !task.complete); + nfs_set_events(client); + } + while (!task.complete) { + qemu_coroutine_yield(); + } return (task.ret < 0 ? task.ret : st.st_blocks * 512); } -- 2.11.0